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Code P1491 on a 1999 Dodge Caravan typically indicates an issue with the air conditioning system, specifically related to the A/C pressure sensor or circuit. This code suggests that the A/C system is not functioning properly, potentially due to low refrigerant levels or a malfunctioning sensor. It's advisable to check the refrigerant levels and inspect the wiring and connections related to the A/C system to diagnose and resolve the issue.
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